*{
    margin:0;
    padding:0;
}
:root{
    //设置根元素字体尺寸
    font-size: 15px;
}

a{
    text-decoration: none;
}
ul{
    list-style: none;
}
.row{
    display: grid;
    grid-template-columns: repeat(12,1fr);
    gap:10px;
}


.col-12{
    grid-column: span 12;
}
.col-11{
    grid-column: span 11;
}
.col-10{
    grid-column: span 10;
}
.col-9{
    grid-column: span 9;
}
.col-8{
    grid-column: span 8;
}
.col-7{
    grid-column: span 7;
}
.col-6{
    grid-column: span 6;
}
.col-5{
    grid-column: span 5;
}
.col-4{
    grid-column: span 4;
}
.col-3{
    grid-column: span 3;
}
.col-2{
    grid-column: span 2;
}
.col-1{
    grid-column: span 1;
}